Tricks for calibration on-sky

• Loop Closed on a bright NGS star with FLAO only 36 modes to keep proper collimation
• VibrationCompensation ON
• Optimise asterism to avoid beam vignetting during actuator steps
• Disable OffloadToLM1
• Close Guider (if any) to start from a well-centered condition.
• setJitterStailizerGain(0.001) on Blue, Yellow and Red.
• Create the proper object BCUJitterStabilizer in the argos terminal and tweak it: nIterInt=1, nIterExt=5, nMeasures=1000, deltaExt=5m
• stop the Guider and start measurement. If lasers drift away too much during the measurement tweak nIterExt
• repeat the measurement several times (5-10) and then check and average reconstructors

New Procedure from March 2017

• open an argos terminal
• generate the FastGuider Calibration object

from argos.terminal.sandbox import FastGuidingCalibrator
fgc = FastGuidingCalibrator(argos)

• Loop Closed on a bright NGS star with FLAO only 36 modes to keep proper collimation
• VibrationCompensation ON
• Optimise asterism to avoid beam vignetting during actuator steps
• Disable OffloadToLM1
• Close Slow Guider (if any) to start from a well-centered condition.
• acquire data in push pull with the function "_acquireInPushPull" and in the meanwhile acquire a snapshot (with the GUI). Use the procedure for both pupilMirror axis.

fgc._acquireInPushPull(self, howManyCycles, howManyStepsUp, commandOffset)

• assign the two snapshot's tracking numbers to two variables stexTn and steyTn
• analyze the data:

from argos.snapshot.analyzer.argos_snapshot_analyzer_terminal import ArgosSnapshotAnalyzerTerminal
terminal= ArgosSnapshotAnalyzerTerminal(argos._indexFile, argos._telescopeSide, argos._logger)
newGreenRec= fgc._analyzeSnapshot(terminal, stexTn, steyTn, commandOffset)

• save the new rec

rec= argos.lgsw.calibrationManager.jitterStabilizerReconstructor('oldRecTag')
rec['GREEN']= newGreenRec
argos.saveJitterStabilizerReconstructor(rec, 'newRecTag', None)

History of experiments

When	Rec	Notes
20160316	See presentation of TM of MPIA Jul 2013 - 20160313_231000 (1)	Rejection of ~10 < 5Hz
20161214	20161214_062600	Measured on-sky on SX. It works OK
20160312	measured on sky (?)	No snapshots available, not working
20160313	measured on sky (?)	No snapshots available, not working
20161021	See fast_guiding.pdf	Test with the 2 actuator axes controlled independently (2)

20160313_231000    [[-0.0004051  -0.00113072], [-0.00163311  0.00084793]]
20161021_105800    [[ 0.18196794,  0.30437769], [ 0.6339633 , -0.39368591]]
20161021_115300    [[ 0.18196794,  0.30437769], [ 0.,  0.]]
20161021_115400    [[ 0.,  0.],[ 0.6339633 , -0.39368591]]
20161214_062600    [[-0.00113842, -0.0060764 ],[-0.00345469,  0.00238202]]

(2) Rec 20161021_105800 is Rguider * Rec 20161021_115300 controls only PM axis 0 and has no rejection Rec 20161021_115400 controls only PM axis 1 and has some rejection of ~10 < 5Hz (?)

-- LorenzoBusoni - 14 Dec 2016